<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

    <style>
        *,
        ul {
            padding: 0;
            margin: 0;
            box-sizing: border-box;
            list-style: none;
        }

        .slider {
            position: relative;
            overflow: hidden;
            width: 100%;
            height: 320px;
            background: pink;
        }



        .ck-slide ul.ck-slide-wrapper {
            position: absolute;
            top: 0;
            left: 0;
            z-index: 1;
        }

        .slider-content {
            width: 50%;
        }

        .ck-slide ul.ck-slide-wrapper li {
            position: absolute;
        }

        .bannersize {
            display: block;
            background-size: auto 100%;
            height: 20em;
            z-index: 1;
            background: url(https://static.wanplus.com/data/event/banner/block/162932.png) no-repeat center top;
        }
    </style>
</head>

<body>
    <div class="slider">
        <ul class="ck-slide-wrapper slider-content">
            <li class="slider-item">
                <div class="bannersize">11111</div>
            </li>
        </ul>
    </div>
    <!-- <div>
        <div class="bannersize">111</div>
    </div> -->
    <!-- 
    <div class="bannersize"></div> -->
</body>

</html>